Anu ,
You r talking about Ravan post Sita Abduction ...The Ravan who fascinates me is the king pre Sita abduction ....
Ravan's first love and true love was Mandodhri ..his lust , obsession was Sita
I agree thanths Krishna's actions do not necessarily have to be similar to Ravan's but his temperament surely is both are hardheaded and simply wanted whatever they set a liking to in one case it was love though it was only gradually he understood how to covey his feelings in the correct manner, while the other case was one of lust/obsession !!